Optimize and simplify loops, table lookups, and branchless parsers

- Replace sequential colon-counting loop with branchless CTZ bitmask in src/pen.h
- Replace linear strchr with 256-bit ASCII punctuation bitmask in src/selection.c
- Flatten 3D color cube loop and precompute constants in src/palette.c
- Use static 256-byte LUT for hex decoding and bsearch for termcap in src/escape.c
- Replace capacity doubling while loops with branchless CLZ pow2 helpers across core
- Use direct memset/memcpy in src/snapshot.c
- Optimize input digit/byte formatting, alt-prefix path, and make keyboard state optional in src/input.c

1 files changed, 1 insertions, 3 deletions

diff --git a/src/screen.c b/src/screen.c
index 681c42b..d6a408d 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -10,9 +10,7 @@
 static void *grow(struct grow_buf *b, size_t bytes)
 {
     if (bytes > b->cap) {
-        size_t cap = b->cap ? b->cap : 256;
-        while (cap < bytes)
-            cap *= 2;
+        size_t cap = term_grow_cap(b->cap ? b->cap : 256, bytes);
         void *data = realloc(b->data, cap);
         if (!data)
             return NULL;